Hasta La Motion!

Hello guys I’m new to this forum! Been searching around after detailed tutorials on how to match move a greenscreen footage into a 3d replacement environment.

*Basically this project is for my module on university. I have several footages that need to be matchmoved into my 3D world*

-The greenscreen part is shooted with Motion-Control Mark Robert at 720i.
-The greenscreen footage is now keyed out and ready for matchmove.
-The 3D world is more ore less completed, just need the texture.
-I’m using Boujou 5 to track my footage and I have already camera solved this.

Ok so here is the question;

-Do I need to camera track still shoot in order to fuse my keyed green screen footage into 3D package(3DMAX in my case)
-How in the world do I ‘fuse’ my green screen footage INTO my 3D package?
-I only know I have to import my camera tracking information exported from Boujou, and what is next?
-Do I use my greenscreen footage AS background IMAGE in my viewport to "eye match" with my 3D world?

Thanks to all seniors spending their time looking forward to a detailed explanation for my dodgy question.

Sincerly regards from Student
Xia